ignition switch/ wires melting

[j.rigby15r]

Alright so I've read numerous threads and have yet to find out what I need. I've got a 64 c10 that I'm trying to hook the wires back up on the ignition switch. I install them the way I understand the wiring but my purple keeps melting. I have the purple going to the st tab, the pink to the ignition tab, red to battery, and the brown I'm not sure were it goes. Can someone help me out here by telling me or sending me picture of the back of your switch. As well as help me understand why the wire is melting. I've melted the purple wire twice. I've thought about rewiring the truck but don't have time or money.